This Wotofo Stentorian Steam Engine Tank features a 6.0ml large liquid capacity with a gold plated 510 center pin. The Steam Engine tank features a 22mm diameter which is compatible with most mods. The dual function top cap not only enables the Steam Engine tank able to fill from top and bottom, but makes Steam Engine a juice flow adjustable tank. There are 3 coils inside this tank kit with 3 different structure, the Steam Engine tank will provide you an overall vaping experience.